Metabolic Pathways for Gamma-Ray Bursts

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There is now a consensus that gamma-ray bursts involve
extraordinary power outputs, and highly relativistic dynamics.
The trigger is probably a binary merger or collapse involving
compact objects. The most plausible progenitors, ranging from
NS-NS mergers to various hypernova-like scenarios, eventually
lead to the formation of a black hole with a debris torus around it.
The various modes of energy extraction from such systems are discussed.